Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R516607 found under Adapter Straight Flange To Boss by C K Power Products Corp. The National Stock Number assigned to this part is 4730015491492, and the Federal Supply Class is 4730 Hose Pipe Tube Lubrication And Railing Fittings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R516607.